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heartbeat
mastery UK /ˈhɑːtˌbiːt/ US /ˈhɑɹtˌbit/noun
card 1 of 9 · fill in the blank
After running up the stairs, his _____ heartbeat slowly returned to normal.
card 1 of 9 · fill in the blank
After running up the stairs, his _____ heartbeat slowly returned to normal.